Analysis of the Induced Brake Moan Noise in the Coupled Torsional Beam Axle Suspension Module

2005 ◽  
Author(s):  
Chan-Jung Kim ◽  
Bong-Hyun Lee ◽  
Chung-Yeol Lee ◽  
Ho-II Jeong
Keyword(s):  
Torsional Beam ◽  
Beam Axle

scholarly journals Coupled bending and torsional beam vibrations excited by a moving load

PAMM ◽  
2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Helmut J. Holl ◽  
Lukas Keplinger
Keyword(s):  
Moving Load ◽  
Torsional Beam

scholarly journals Gravity-Insensitive Flexure Pivot Oscillators

2018 ◽  
Vol 140 (7) ◽  
Author(s):  
M. H. Kahrobaiyan ◽  
E. Thalmann ◽  
L. Rubbert ◽  
I. Vardi ◽  
S. Henein
Keyword(s):  
Rigid Body ◽  
Quality Factor ◽  
Plain Bearing ◽  
Drastic Reduction ◽  
Leaf Springs ◽  
Order Of Magnitude ◽  
Torsional Beam ◽  
The Cross ◽  
Long Stroke ◽  
Magnitude Increase

Classical mechanical watch plain bearing pivots have frictional losses limiting the quality factor of the hairspring-balance wheel oscillator. Replacement by flexure pivots leads to a drastic reduction in friction and an order of magnitude increase in quality factor. However, flexure pivots have drawbacks including gravity sensitivity, nonlinearity, and limited stroke. This paper analyzes these issues in the case of the cross-spring flexure pivot (CSFP) and presents an improved version addressing them. We first show that the cross-spring pivot cannot be simultaneously linear, insensitive to gravity, and have a long stroke: the 10 ppm accuracy required for mechanical watches holds independently of orientation with respect to gravity only when the leaf springs cross at 12.7% of their length. But in this case, the pivot is nonlinear and the stroke is only 30% of the symmetrical (50% crossing) cross-spring pivot's stroke. The symmetrical pivot is also unsatisfactory as its gravity sensitivity is of order 104 ppm. This paper introduces the codifferential concept which we show is gravity-insensitive. It is used to construct a gravity-insensitive flexure pivot (GIFP) consisting of a main rigid body, two codifferentials, and a torsional beam. We show that this novel pivot achieves linearity or the maximum stroke of symmetrical pivots while retaining gravity insensitivity.

Hybrid quenching method of hot stamping for automotive tubular beams

2015 ◽  
Vol 231 (9) ◽  
pp. 1599-1610 ◽  
Author(s):  
Jong-Kyu Park ◽  
Yang-Su Kim ◽  
Chang Hee Suh ◽  
Young-Suk Kim
Keyword(s):  
High Strength Steel ◽  
Hot Stamping ◽  
High Strength ◽  
Torsion Beam ◽  
Stamping Process ◽  
Die Quenching ◽  
Ultra High Strength Steel ◽  
Quenching Method ◽  
Torsion Beam Axle ◽  
Beam Axle

Recently, tubular-type coupled torsion beam axle, which is a component of the automotive rear suspension systems, has been developed by using ultra-high strength steel. It is manufactured by hot stamping process to enhance the strength and reduce springback. The hot stamping process is classified as a direct method and an indirect method according to forming sequence and quenching method, so-called die quenching or water quenching. Each of these methods has limitations in the aspect of dimensional accuracy and strength. Hybrid quenching is a new quenching method which sprays water to the tube directly in addition to die quenching. In this study, direct hot stamping with hybrid quenching was applied to produce an automotive tubular coupled torsion beam axle of ultra-high strength steel. This study proposes a simulation method of hybrid quenching for tubular beam and the hybrid quenching method was evaluated experimentally. Finally, the proposed hybrid quenching method has been found very effective in reducing the cooling time and thermal deformation.

scholarly journals An Equivalent Non-uniform Beam-like Model for Dynamic Analysis of Multi-storey Irregular Buildings

2020 ◽  
Author(s):  
Annalisa Greco ◽  
Ilaria Fiore ◽  
Giuseppe Occhipinti ◽  
Salvatore Caddemi ◽  
Daniele Spina ◽  
...  
Keyword(s):  
Dynamic Analysis ◽  
Large Scale ◽  
Numerical Models ◽  
Equations Of Motion ◽  
Uniform Beam ◽  
Uniform Shear ◽  
Modes Of Vibration ◽  
Urban Level ◽  
Torsional Beam ◽  
Computational Procedures

Dynamic analyses and seismic assessments of multi-storey buildings at urban level require large-scale simulations and computational procedures based on simplified but accurate numerical models. At this aim the present paper propos-es an equivalent non-uniform beam-like model, suitable for the dynamic analysis of buildings with asymmetric plan and non-uniform vertical distribution of mass and stiffness. The equations of motion of this beam-like model, which pre-sents only shear and torsional deformability, are derived through the application of Hamilton’s principle. The linear dy-namic behaviour is evaluated by discretizing the continuous non-uniform model according to a Rayleigh-Ritz approach based on a suitable number of modal shapes of the uniform shear-torsional beam. In spite of its simplicity, the model is able to reproduce the dynamic behaviour of low- and mid-rise buildings with a significant reduction of the computa-tional burden with respect to that required by more general models. The efficacy of the proposed approach has been tested, by means of comparisons with linear FEM simulations, on three multi-storey buildings characterized by different irregularities. The satisfactory agreement, in terms of natural frequencies, modes of vibration and seismic response, proves the capability of the proposed approach to reproduce the dynamic response of complex spatial multi storey frames.

A 2-axis electrothermal MEMS micro-scanner with torsional beam

2016 ◽  
Author(s):  
Quentin A. A. Tanguy ◽  
Can Duan ◽  
Wei Wang ◽  
Huikai Xie ◽  
Sylwester Bargiel ◽  
...  
Keyword(s):  
Torsional Beam

Exact frequency response of two-node coupled bending-torsional beam element with attachments

2018 ◽  
Vol 63 ◽  
pp. 508-537 ◽  
Author(s):  
Andrea Burlon ◽  
Giuseppe Failla ◽  
Felice Arena
Keyword(s):  
Frequency Response ◽  
Beam Element ◽  
Torsional Beam
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